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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6988) Add configurable limit for percentage-based eviction threshold
Date Fri, 03 Oct 2014 20:35:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158494#comment-14158494

Colin Patrick McCabe commented on HDFS-6988:

bq. If we are going with a single value can you suggest a default.

What we did in HDFS-4949 was to make the feature off by default, and require admins (or management
software) to configure it in order to use it.  We could adopt this approach for HDFS-6581
as well.

We already know that some configuration will be required, since sysadmins need to set up the
ramdisk.  It will never be possible to simply upgrade your software and immediately get HDFS-6581,
since you won't have a ramdisk by default.  So making admins (or management software) set
an HDFS configuration key as well seems fine.

> Add configurable limit for percentage-based eviction threshold
> --------------------------------------------------------------
>                 Key: HDFS-6988
>                 URL: https://issues.apache.org/jira/browse/HDFS-6988
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>             Fix For: HDFS-6581
>         Attachments: HDFS-6988.01.patch, HDFS-6988.02.patch
> Per feedback from [~cmccabe] on HDFS-6930, we can make the eviction thresholds configurable.
The hard-coded thresholds may not be appropriate for very large RAM disks.

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